Hi,
I installed debian stable kde with live cd
"debian-live-6.0.3-i386-kde-desktop.iso". My PC was not
connected with internet, so after the installation, my
source.list file was with only one line of cd - repository.
Then I populated source.list with following
repositories because I want to install debian with testing.

To convert debian stable in testing, I fired following
commands.
apt-get update
apt-get dist-upgrade
But dist-upgrade failed with following error.
"E: Could not perform immediate configuration on
'phonon-backend-vlc'. Please see man 5 apt.conf under
APT::Immediate-Configure for details. (2)"